The DSM Differential Settlement Monitoring System has been developed by Sisgeo for automatic and continuous long-term monitoring of differential settlements or heaves of buildings and structures.
The DSM structure system consists of a series of DSM tank-gauges interconnected by a small hydraulic tube to a reference tank, which is located on a firm point away from the area that is going to be monitored.

The hydraulic tube is filled by a de-aired mixture of 50% glycerine (99%) and 50% water. This mix is usually supplied by Sisgeo and is chemically inert to all components in the system.
The measurement of fluid level inside each DSM tank indicates the elevation difference between the sensors and the reference tank.

Technical specifications

DSM LEVEL GAUGE
Type of sensor    High sensitivity load cell
Measuring range    ±40mm water level
Sensor sensitivity    0.01mm
Sensor accuracy    ±0.1mm (thermal effects not included)
Difference in elevation    Straight-horizontally
Housing dimensions    400x300x200mm

DSM LONG RANGE LEVEL GAUGE
Type of sensor    Linear potentiometer
Measuring range    800mm
Sensor sensitivity    0.01mm
Sensor accuracy    ±0.5mm (thermal effects not included)
Difference in elevation    Up to 800mm
Housing dimensions    0D 68mm, 1050mm high
DSM systems are very sensitive to temperature changes. Accurate measurements require that temperatures be monitored at sensor locations. Data is processed utilizing “Fieldstat” software..